Abstract: Soybeans were extracted for oil by compressing a ground sample at various operating pressures, pressing durations and product bulk temperatures. The oil yield from the various operations was measured and expressed as a percentage of the original mass of crushed seeds.
What is oil yield as a function of soybean moisture content?
Fig. 3: Oil yield as a functionof soybean moisture content at five fixed extraction pressure during mechanical extraction. Variation of oil yield from soyabean with extraction pressure at six preheat temprature of soyabean are set at 9.3% (db) and six minutes respectively. 2 between 70 and 80 kgf/m is much lower.
Does extraction pressure affect the yield of soybean meal?
The effect of the duration of application of extraction pressure on the yield for soybean meal that has had no preheat treatment can also be observed in Fig.2. It can be seen that the percentage yield increases with the duration of extraction at all extraction pressures.
How does a screw oil expeller work?
Another popular type, the screw oil expeller, works by compressing the product in a tube. A screw which is rotates inside the tube forces oil out of the compressed mass to escape through an enclosing screen that runs parallel to the screw and along the tube-wall while the spent cake is extruded through the end of the tube.